ci/labeler: upgrade to v5 format

[sumnerevans]

Description

actions/labeler@v5 had breaking changes that I failed to update for in #5496. This PR should hopefully fix it.

I was unfortunately not able to catch the issue because the labeler config seems to be based on whatever is in the master branch, so CI didn't catch it on the original PR.

I'm going to need @rycee to help bail me out here.

Signed-off-by: Sumner Evans [email protected]

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • Added myself as module maintainer. See example.

Maintainer CC